Surface light-source device using light-emitting elements

  • US 7,537,368 B2
  • Filed: 11/30/2006
  • Issued: 05/26/2009
  • Est. Priority Date: 11/30/2005
  • Status: Active Grant
First Claim
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1. A surface light-source device comprising:

  • (A) at least one luminescent panel including a plurality of light-emitting element lines formed by aligning light-emitting elements in each line;

    (B) at least one light guide unit for guiding light of said luminescent panel toward the outside, said light guide unit including;

    a rectangular light emission surface for emitting the light to the outside;

    a thick portion formed from a central area of said light emission surface toward an opposite surface of said light emission surface, said thick portion being parallel to one edge of said light emission surface;

    thin side portions disposed at said one edge and the other edge opposite to said one edge, each of said thin side portions being formed more thinly than said thick portion;

    an incline rear portion formed between said thick portion and said thin side portions, said incline rear portion becoming thinner from said thick portion toward said thin side portions; and

    a parallel groove formed in said thick portion so as to be parallel to said one edge, said parallel groove having a section taken in a direction perpendicular to said one edge and formed in a shape, which is symmetrical about a center line perpendicular to said light emission surface and a width of which dwindles toward said light emission surface, and at least two of said light-emitting element lines being disposed inside said parallel groove at symmetrical positions relative to said center line so as to be parallel to said one edge.

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